People are generally aware of the most common causes of hallucinations, like schizophrenia and a really high fever. But lesser known are the more rare causes; here are six you probably haven't heard about.

Digestive Disorders

All diseases that pertain to the gastrointestinal tract are labelled as digestive diseases. This includes symptoms and diseases of stomach and intestines, such as: constipation, diarrhea, GERD, heartburn, gas, bloating, hemorrhoids, irritable bowel syndrome (IBS) and others.